pierce



N. PIERCE.

. CARBU-RETEH. I APPLICATION FILED APg.2I, 1915. RENEWED JAN.26. 191a. 1,19%,876. 7 PatentedAug.15,191(i.

2 SHEETSSHEET I.

B. N, PIERCE.

CARBURETERJ, -APPL|CATION men APR. 21, 1915. RENEWED IAN. 26.1916. 1,1 94,876. Patented Aug. 15,1910.

2 SHEETSSHEET 2.

I which the ollowing is a specification, refer- BURT NEUIQQEIIEBCE, Q FLINT, M ICHIGAN'.

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specification of Letters Eatent.

Peteuteu Aug; 15, 1916.

Application filed April- 21, 1815', Serial 3%. 22,839. Renewed Ianuery 26*1916, Serial No. 74,478.

To all whom it may concern:

@Be it known that I, BURT Nnunou Brunei a citizen of the United States, res1d1ng at Flint in the county of Genesee and State of Michigan, have invented certain new and useful 1m rovements' in Cerbureters, ,of

ones being hadtherein to the accompanying drewi'n I I This invention relates to certain new and useful improvementsjin carburete'rsund is ,.an improvement upon a construction of can bureter as disclosed in my application filed February lll, 191.5,qSerihl Number 9324; the

' object being to provide means for adjusting the position of, the-floating valve in the auxiliary sir chamber so as to allow a large volume of air to. pass into the carburetor through the auxiliary air inlets'to decrease the suction in order to prevent gas from being drawn into the carburetor when coasting down a hill and the motor is being used as a broke.

Another object of my invention isto provide a spring support'forthe floating valve which normally floats the some in order. to hold the floating valve slightly raised so as .to allow an additional volume of air to enter the carburetor in order to regulate the idling of the motor or to allow u greater volume of air to enter the mixingchamber to decrease the mixture in order to obtain a greater mileage. y t y other object of the invention is to provide means for regulatinptthefloating valve which is" manually controlled from the dash in order that the fioutingi velve can be nd justed into various positionsivin respect to its seat. l p

Other and further objects and advantages of the invention will be hereinafter set forth and the novel features thereof defined by the appended claims.

In the draWings.Figure 1, is e pers )ective of my improved construction'of corb'uret'er; Fig. 2, 1s a' longitudinal vertical section through the some; Fig. 3, e per spective of the yoke and its operating means;

showing the spring for supporting: the flout I means for retarding the oscillation of the crank shaft.

Like numerals of reference refer to like parts in the several figures of the drawings.

y In the drawings, 1 indicates the bowl of a carburetor which is provided with the usual floet and 'i'uel supp y chamber. A central tubular member 2 is mounted within the bowl, forming a central air duct to which is connected. an air supply pipe 3 said air duct having a main fuel valve control nozzle 4 extending into n- Venturi tube 5 mounted within the air duct, said Venturi tube prober 2; Arranged over the bowl above the flange of the tubular member, is a cusingfi forming an auxiliary sir chamber 7 having oppositely disposed nirinlets 8, and mountjecting upwardly beyond the tubular memed on 'top of the casing 6 is a casing 9 pro- 'vided with a mixing chamber 10 at its lower end into which the upper. end of the Venturi ,tubc extends and a, throttle chamber 10 at its upper end having the usual pivoted throttle valve mounted therein, said casing being provided with n heutingchamber.

A high speed nozzle 12 13 arranged within the auxiliary sir chamber and. is carried by a tube which extends down into the bowl is provided with nconicul valve seat 13 in,

which is adapted to be seated, the conical marginal edge of shooting valve 15 which is provided with a bearingsleeve 16 slidu'bly mounted upon the upper end portion of a Venturi tube, as clearly shown in Fig. 2. A forlc 17 is mounted on a shaft arranged ithin the mixing chamber and is normally heldin a plane slightly above the floating valve so that when the valve is raised, a reslstsnce is exerted aga nst the upwerdinovement of the floating valve through the medium of uweight 'cnrriedflbyan ermsecured upon said shaft so as to reterd the opening movement thereof. I

The construction so far described, is substantially the same as disclosed in my application, Serial Number 9324, filed February 19, 1915, with the exception of the heating valve, which is formed slightly heavier for the purpose hereinafter fully deserilml.

My iniproveluent upon the construction so far described, is the provision of means for 1 rod 23 which is adapted to extend to the (la sh of the motor vehicle to which the carliuretcr is attached so that the shaft 21 can be rocked in order to shift the position of the cam 20 so as to adjust the position of the yoke 18.

The under side of the floating valve-is prowided with an annular recess to receive the 1?)81 portion of a coil spring 24 which is c rricd by a flanged collar 25 mounted upon the arms of the yoke 18, as clearly showirin Figs. 2 and 3, whereby by operating the rod 23,. the yoke can be adjusted into any of the positions shown in Fig. l, so as to adjust the position of the floating valvein respect to its seat. 1

\Vhen the cam on the shaft 21, is m the positibn shown in Figs. 2 and 3, the yoke is in lowered position so as to allow the floating valve to drop tightly onto its seat so as to ciitotf the auxiliary airsupply in order to increase the motion within the 'Venturi tube whereby the richness of the mixture will be increased so that the-motor to which the carbureter is attached can be readily started in cold weather or when the motor is cold.

By shifting the cam through the medium of the shaft and operating rod into central position, the yoke is raised to such an extent that the floating valve is raised oil of its seat approximately five-sixteenths of an inch which allows such a volume of air to pass through the auxiliary air chamber into the mixing chamberthrough the air inlet ports thereof, that the suction is decreased to such an extent that air will not enter through the Venturi tube and the inotor can be used for braking the vehicle without wasting fuel. By oscillating the shaft carrying the cam so as to move the cam' over to the other side of the shaft, the yoke 18 will be .thrown into intermediate position so as to slightly float the floating valve and regulate the idling otthe motor; an adjustable stop 26 being employed which is adapted to cooperate with the crank 22 so as to limit the movement of the cam in respect to the portion 19 of the yoke 13 whereby the position of the yoke can be readily adjusted so as to adjust the relative position of the lloating valve in respect to its seat. liy adju.-ling the floating valve in tl1is111a1111e1',tl1e richness of the mixture can be decreased so as to obtain a reater mileage.

flirom the foregoing description, it will be seen that I have provided a carbureter with a main nozzle and an auxiliary air chamber having a floating valve for controlling thc (onnnunieation between said auxiliary air chamber and mixing chamber: said valve be* ing supported by a pivoted yoke through the medium of a spring; for adjusting the position of the yoke so as to regulate the volume of air entering the mixing chamber. whereby the engine to which the carbureter is attached, can be used for b 'aking the vehicle when roasting down a hill. g

The form of slop 26 as herein shown for limiting the movement of the crank, comprises a screw working in a threaded bore formed in a bracket extending from the easing of the carbin'eter, said bracket carrying a spring member cooperating with the head of the screw for holding the sonic in adjusted position, and it will be seen that by adjusting the stop, the position of the yoke withinthe chamber can be changed so as to hold the floating valve oli' of its seat, tl1eproper distance.

\Vhile I have shown and described particular means for adjusting the position of the yoke for supporting the lloating valve, I do not wish to limit myself to any exact construction for accomplishingthis result, as various other means can be employed without departing from the spirit otmy invention.

In the drawings, I have shown the operating rod :23 connected to a stud pivotally mounted in the free end of the crank arn'1 22 in order to provide a pivotal connection between the rod and crank arm; but it is, of course, understood that other means can be employed for connecting theoperating rod to the crank and that the operating rod can be connected in various ways through the Inc- 1neans being provided t diurn of links and lovers to a suitable manuseat.

arranged under said valve, a pivoted'mem ber arranged in the ath of travel of saidsuction-controlled v'a ve for retarding the mevemeiitjthereof, anda spring for floating said val 3 I carbureter, the. combination with themixiii'gjchamber thereof, of a Venturi tube extending, into said mixing chamber, a

rena e arranged within said Venturi tube, an' aux liary air chamber, ,a floating valve' s'lidably mounted upon said Venturi tube for controlling communication between said air chamber and mixing chamber, and means adjusting the position of said floating valve in respect to its seat.

4. Ina carburetor, the combination with a floating suction c'ontrolledvalve, a nozzle arranged under said, valve, meansfor retarding the opening movement, of said valve, and means for adjusting the relative position of said valve in respect toits seat.

5, Acarbureter, having a main fuel nozzle andan'auxiliaryfuel nozzle, a floating valve arranged over the auxiliary fuel nozzle,.

means for retarding the upward movement thereof, and means for adjusting the positionf'of saidvalve in respect to its. seat.

: 6; Acarbureter, havinga mixing cham- 'ber, Yenturi tube extending into said chamber, an auxiliary. air chamber surroundingnaid Venturi tube in a plane below said mixing chamber, a floating suction-controlled valve slidably mounted upon said- Venturiitube for closing said air chamber, and means for adjusting the position of said suction-controlled valve in respect to its 7. A carbureter, having a mixing chamber, a Venturi tube ,xtendiiig into said mix ing chamber, a fue nozzlearranged within said Venturi tube, an air chamber surrounding said Vent-311i tube below said mixin chamber provided with a high speed nozzle,

controlling the passage of air to the auxil iary air inlet, spring for floatin said valve; and manually operated means or adjusting the position of said spring.

9. -A carbureter, having an auxiliary air aVenturi tube, a main fuel nozzle arranged within said Ventun tube, a suction-controlled valve for closing said auxiliary air chamber, and manually operated means for supporting said suction-controlled valve in "different positlons above its seat.

10. A carbureter, having a main fuel nozzle, an air passage surrounding said nozzle,

an auxiliary air chamber, a suction-cone y I v v trolled floatlng valve'for closing sa1d auxiliary a r chamber, and a cam-operated member]. for supporting said suction-controlled.

valve in different positions in respect to its seat. a

11. A carbureter, having a mixing chamber, a mainfuel "nozzle, and an air passage surrounding said nozzle and extending to said mixing chamber, an auxiliary air chamber having communication with said mixing chamber, a SIICtIOIICOHtI'OllBd valve for controlling communication between said mixing chamber'and air chamber, a spring for floating said valve; and manually operfated means for adjustably supporting said spring for adjusting the positionof said seat.

12, A carbureter, 'having mixing cham- I her, a Venturi tube extending into said suction-controlled valve in; respect to its n chamber, an auxiliary air' chamber having communication with said mixing chamber, a

suction-controlled valve for controlling communication between's'aid mixing chain-1 her and air chamber, a spring arranged 1111-" der said suction-controlled valve, a yoke forv supporting said spririgjand manually oper- 1 ated means for adjustmgsaid yoke.

13.11). a carburetor, the combination with I g a floating suction-controlled valve, of a spring" for floating said valve, a yoke for supporting said spring; andmeans for adjusting the position of said yoke.

14. A carbureter, having a main fuel nozzle and an auxiliary fuel nozzle surrounded by air passages, a floating valve arranged over said auxiliary fuel nozzle, a spring for floating said valve, and adjustable means for supporting said spring.

15. A carbureter, comprising a casing having a mixing chamber and an air chamber,

a floating valve for controlling communical lo I tion between {said air chamber and mixing chamber, a pivoted yoke, a flanged collar mounted upon said yoke, a spring carried by said collar for supporting'said valve, a cam codperating with said yoke, 'a shaft upon which said cam is mounted, and manually operated means for oscillatin said shaft for. v

adjusting the position of sai yoke.

16. A carbureter, having a' fuel chamber provided with a central air passage, an air chamber arranged upon said fuel chamber, a mixing chamber arranged. above said air chamber, said air chamberhaving an opening communicating with said mixin chamber, a Venturi tube arranged Within the air passage extending into said mixing chamher, a fuel nozzle arranged within said Ven,

turi tube, a fuel nozzle arranged within said ally operated means for adjusting the position of said valve in respect to sa1d seat 17. In a carburetor, the combination wlth a fuelchamber having a central air passage,

of an auxiliary air chamber arranged with in said fuel chamber, a Venturi tube arranged within said air passage extending through said auxiliary air chamber,.a mixing chamber arranged within said auxiliary air chamber, a suction-controlled valve for controlling communication between said mixing chamber and auxiliary air chamber, a fuel nozzle arranged within said Venturi tube, and manually pperated means for adjusting therelative position of said suctioncontrolled valve in respect to'its seat.

18. A carburetor, having a mixing chamber and means for conveying air and fuel thereto, an auxiliary air chamber having communication with said mixing chamber, a valve for controlling communication between said mixing chamber and air chamber, a high speed nozzle arranged in'said auxiliary air chamber adjacent said valve and means for adjusting the relative position of said valve in respect to its seat.

19. A carbureter, having a mixing chamber and an auxiliary air chamber communicating therewith, a valve for controlling communication between sa-idmixing chamberand auxiliary air chamber, a pivoted yoke mounted in said air chamber, a flanged sleeve carried by said yoke; a spring carried by said sleeve for floating said valve, and

melgns for adjusting the position of said yo e.

20. A carbu'reter, having a main fuel nozzle and means for conveying air thereto, an auxiliary air chamber, a valve for control,

ling the passage of air through said chamber, means for floating said valve; means for retarding the opening movement of said valve, and means for adjusting said floatin means for adjusting the position of sai floating means for adjusting the position of said valve in respect to its seat.

22. A carbureter, having a Venturi tube surrounded by an auxiliary air chamber, a floating valve slidably mounted upon said tube controlling the passage of air throu h said; auxiia'ry chamber, a pivoted yo e mounted in said chamber, a spring carried by said yoke for supporting said valve, and

- means for adjusting the position of said yoke within said chamber. i In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

BURT NEULON PIERCE.

\Vitnesses:

Bmms E. Woonrrrr, Emaonn J. Macmusna. 

